Electromagnetic clipper regulation



Decf 20, 1932. L, J, WAHL 1,891,486

ELECTROMAGNETIC CLIPPER REGULATION Filed sept. 21. 19:51

Patented Dec. 20, 1 932 UNITED STATES PATENT OFFICE LEO J'. WAHL, OF STERLING, ILLINOIS, ASSIGNOR TO WAHL CLIIE'PER CORPORATION, l u

OF STERLING, ILLINOIS, A CORPORATION 0F. ILLINOIS ELECTROMAGNETIC CLIPPER REGULATION v.

Application led September 21, 1931. Serial 190.564,061.

My invention relates to electromagnetic vibrating devices such as hair clippers. In these devices the energy is supplied usually from a 60 cycle source of alternating current so that the tool or workpiece is moved to and fro at avery rapid rate. Y

In such rapidly vibrating devices, it is essential to have proper regulation so that the usual variations in line voltage of the power source will not cause so great a change in the amplitude of vibration as to injure 'the device or cause it -to operate so poorly as to cause trouble. i

If the voltage at its higher values causes too great amplitude of vibration, the device becomes very noisy due to the armature hitting the pole pieces of the magnet or other stationary parts of the device. l

It is the purpose of this invention to provide means for automatically regulating the 'device so as to eliminate the'foregoing ditiiculty without making adjustments by the` operator necessary. y It is also the purpose of this inventlon to provide means to automatically limit the increase `in amplitude of vibration of the work piece in response to increased voltage which means cooperates with the Work piece carrying armature to act as a counterbalance and thus effect smoother operation.

Iwill describe the preferred form of my invention by reference 'to the accompanying drawing whereini i Fig. 1 is a top plan view of the electromagnetic clipper embodying my invention;

Fig. 2 is asideview of the armature elements of the clipper;

, Fig. 3 is a top plan view'lsimilar to Fig. 1 but .with parts of the casings broken away illustrating a modification; l Fig. 4 is a section substantially on the line 4*-4 of Fig. 1; l

Fig.- 5 illustrates a further modificati-on.

Fig.l 6 is a sectional view on line 6-6 of Fig. 2. A

Referring now in detail to the drawing, I

show a clipper casing at -having the stationary blade 6 upon which a movable blade 7 is adapted to move in a Well knownmanner.

This movable blade is driven by an arm 8 which is mounted upon the armature 9. Suitable core l0 and coil 11 are used for causing Y armature 9 to vibrate in the usual manner when the coil is energized 'from a source of alternating current.v The armature 9 has a fixed mounting at 12. That is to say, no provision is made for manually adjusting this armatureA to take care of variations 1n its amplltude of vibration due to differentvolt- .ages impressed upon the device. In 'other words, it has what I term' a fixed tune mounting. The armature is tuned originally to the lproper value f or example by grindingA out portions as indicated at 13 and 14.

vNow in order to make the operationfof the armature steady under varying voltages,`

the -proper` construction ofthe arm cause Y this arm to operate as a shunt to deprive the armature 9 of part of the lattraction from the core and thus make it operate more steadily. That is to say, this lighter arm responds more readily to the changes in mag-` netic pull and 'as the voltage increases it moves 4closer to the core and operates as a shunt to shunt part of the magnetic circuit around themain armature 9 thus reducing the effective proportionate force applied to the main armature. In this manner the main armature is prevented from excessive vibration due to increases in the voltage above that for which it is normally set. The lighter arm 15 may in some cases desirably be slightly out of tune, that is, tuned lower lin which case I find it Works better as the current gets stronger.

Referring now to Figs. and 4, in thisv armature 9 which drivesthe work piece or clipper blade. 'Ihe purpose of so operating arm 15 is to cause it not 'only to operate asa regulator but also as a counterbalance attracts arm at the same time it attracts 2armature 9 to cause them both to move toward the upturned portion 17 and thus in opposite directions with respect to each other. With this exception the modification shown in Figs. 3 and 4 functions substantially the same as that shown in Figs. 1 and 2.

The modification in Fig. 5 illustrates another method of accomplishing certain desired results similar to those obtained by the structures disclosed in Figs. 1 4.` In this 'form the core 21 and armature 20 are mounted in the usual manner, the armature being secured at 23 and carrying the blade 22. An opening is provided at 24 in the armature and a control bar 25 mounted in the core isV arranged to project into the opening more or less as the armature approaches and recedes from the core; This bar is yieldingly positioned by springs 28 and 29 on opposite sides of the collar 27 in recess 26. The screw plug 30 holds the springs in place and serves as a means for changing the eiect of the bar 25 by causing it to progect more or less from the core. a

The operation of the device shown in Fig. 5 is very similar to that shown inthe other figures. This bar 25 will as the voltage 1ncreases project farther through the opening 24 and, as it is effectively a part of the core,

' will naturally cut down the attractive number of lines of force that are effective upon the armature.

From the above description, it is thought thatthe construction and operationof this device will be clearto those skilled in this art and the advantages thereof readily apparent.

Having thus described one specific form of my invention, what I claim as new and desire to secure by Letters Patent is:

1. An electromagnetic vibrating device comprising an electromagnet having means whereby -it may be energized by pulsating electric current, an armature movable relative thereto in response to the pulsations of the energizing currentand adapted to carry a work piece, and a regulating arm mounted to vibrate 1n response to energization of said electromagnet, said arm being attracted more asthe voltage increases whereby to shunt more of the magnetic field around the work piece carrying armature and reduce the eiect of the increased voltage thereon.

, 2. An electromagnet vibrating device comthereto in response to the pulsations of the energizing current and adapted to carr a work piece, and a regulating arm mounte to vibrate in response to enervization of said electromagnet, said arm being attracted more as the voltage increases whereb to shunt more of the magnetic field aroun the work piece carrying armature and reduce the effect of the increased voltage thereon, said arm being lighter than said armature.

3. An electromagnetic vibrating device comprising an electromagnet having means whereby it may be energized by ulsating electric current, an armature movab e relative thereto in response to thepulsations of the energizing current and adapted to car a work piece, and a regulating arm mounte to lvibrate in response to energization of said electroma et, said arm being attracted more as the vo tagevincreases whereby to shunt more of the magnetic field around the work piece carrying armature and reduce the effect of the increased voltage thereon, said arm extending substantially parallel to the armature.

4. An electromagnetic vibrating device comprising an electromagnet having means whereby it may be energized by pulsating electric current, an armature movable relative thereto in response lto the pulsations of the venergizing current and adapted kto carry a work piece, and a regulating arm mounted to vibrate in response to energization of said elcctromagnet, said arm operating to reduce the proportionate effective attraction vupon said armature as the voltage increases.

5. An elecromagnetic vibrating device comprising an electromagnet having means whereby it may be energized by pulsating electric current, an armature movable relative thereto in response to the pulsations of the energizing current and adapted to carry a work plece, and a regulating arm mounted to vibrate in response to energization of said elec-tromagnet, said arm operating to reduce the proportionate effective attraction upon said armature as the voltage increases, said arm and armature being attracted in opposite directions whereby the arm operates as a. counterbalanc'e..

6. An electromagnetic vibrating device comprising an electromagnet having means whereby it may be energized by ulsating electric current, an armature movab e relative thereto in response to the pulsations of the energizing current'and adapted to carry a Awork piece, and a regulating arm mounted to vibrate in response to energization of y.

more as the voltage increases whereby to shunt more of the magnetic field around the Work piece carrying armature and reduce the effect of the increased voltage thereon, said arm and armature being attracted in opposite directions whereby the arm operates as a counter-balance.

7. An electromagnetic vibrating device comprising an electromagnet having means whereby it may be energized by pulsating electric current, an armature movable relative thereto in response to the pulsations of the energizing current and adapted to carry a work piece, and a regulating arm mounted to vibrate in response to energization of said electromagne-t, said arm being attracted more -as the voltage increases whereby to shunt more of the magnetic field around the work piece carrying armature and reduce the effect of the increased voltage thereon, said arm being lighter than said armature, said arm and armature being attracted in opposite directions whereby the arm operates as a counterbalance.

8. An electromagnetic vibrating device comprising an electromagnet having means whereby it may be energized by pulsating* electric current, an armature movable relative thereto in response to the pulsations of the energizing current and adapted to carry a work piece, and a regulating arm mounted to vibrate in response to energization of said electromagnet, said arm being attracted more as the voltage increases whereby to shunt more of the magnetic field around the work piece carrying armature and reduce the eii'ect of the increased voltage thereon, said arm extending substantially parallel to the armature, said arm and armature being attracted in opposite directions whereby the arm operates as a counterbalance.

9. An electromagnetic vibrating device comprising an electromagnet having means whereby it may be energized by pulsating electric current, an armature movable relative there'to in response to the pulsations of the energizing current and adapted to carry a work piece, and a reguiating arm mounted to vibrate in response to energization of said electromagnet, said arm operating to reduce the proportionate effective attraction upon said armature as the voltage increases, said arm extending substantially parallel to the0 armature.

10. An electromagnetic vibrating device comprising an electromagnet, an armature movable relative thereto and adapted to carry a work piece, and a regulating arm mounted to vibrate in response to energization of said electromagnet, said arm'operating to reduce the proportionate effective attraction upon said armature as the voltage increases, said electromagnet having a portion of its core lying between the arm and armature.

11. An electromagnetic vibrating device comprising an electromagnet, an armature movable relative thereto and adapted to carry a work piece, and a regulating arm mounted to vibrate in response to energization of said electromagnet, said arm being attracted more as the voltage increases whereby to shunt more of the magnetic field around the work piece carrying armature and reduce the effect of the increased voltage thereon, said electroand. said arm having a weight adjacent the free end thereof.

In witness whereof, I hereunto subscrlbe my name this 25th day of August, A. D.

LEO J. WAHL. 

